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How I can implement phase shifter of 90 degree without using Flip flops? | Cypress Semiconductor

How I can implement phase shifter of 90 degree without using Flip flops?

Summary: 10 Replies, Latest post by odissey1 on 05 Oct 2016 10:31 AM PDT
Verified Answers: 1
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maknight's picture
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203 posts

Hi All,

I am looking for a way through which I can shift my signal by 90 degrees. I want to avoid using flip flops.

Looking forward to your suggestions.

 

Regards

Awais

user_1377889's picture
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9842 posts

"shift my signal by 90 degrees" So, what is your signal? Where does it come from. I just assume it is a digital signal, is it?

And what is the reason you do not want to use a FF.

 

Bob

maknight's picture
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203 posts

Thank you, Bob, for your reply!

Correct, It's a digital square wave signal coming out of the comparator and entering into the LO input of the Mixer.

I am avoiding using flip flop because, in my full schematic design, I get half of the frequency at the output of the flip-flop.

I was thinking about shift register but I am not sure how should I use it. Maybe a shift register with the not gate? What do you think could be the best thing i can do about it?

Looking for your reply!

Regards

Awais

 

 

 

user_1377889's picture
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9842 posts

Frequency range?

 

Bob

 

maknight's picture
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203 posts

It's about 100 KHz

user_1377889's picture
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9842 posts

You could try to measure signal high and low time (or frequency and duty cycle) and generate a 90 degrees shifted signal using a PWM.

 

Bob

maknight's picture
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203 posts

This could be possible but I would not be flexible if my input frequency would change for some reason.

user_1377889's picture
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9842 posts

I thought for a constantly measure of a single cycle input signal and controlling the PWM. Can probably done with a 100kHz signal. What are the precision restrictions you have got? And: What is the lowest frequency to handle?

 

Bob

maknight's picture
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203 posts

I can maximally go town to 90KHz.

 

 

user_1377889's picture
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9842 posts

Quite tough, give it a try...

 

Bob

user_342122993's picture
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609 posts

maknight,

you can use PLL to get 90 deg shift

http://www.edn.com/design/analog/4411037/Demystifying-the-PLL

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